Las Vegas hotels and casinos are beefing up security in the wake of Sunday’s mass shooting that left 59 people dead.

At the luxury Wynn resort on the Las Vegas Strip, guards began scanning visitors with metal-detector wands and inspecting their bags Monday afternoon, Bloomberg News reported.

Other hotels will likely follow suit in the aftermath of the Las Vegas massacre, which was carried out by Stephen Paddock from his 32nd-floor room at the Mandalay Bay Resort and Casino.

David Shepherd, a former FBI special agent in counterterrorism who went on to work as a security director for the Venetian resort in Vegas, said hotels and casinos will now have to consider the many ways an attacker could strike.

“We have to start thinking like the Secret Service — start looking at tall buildings,” he told Bloomberg. “How far do we have to take it?”

The Nevada Gaming Control Board said it will put undercover security guards inside casinos across the country, CNN reported.